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M E A S U R I N G   L I G H T (continued)

5. PHOTOMETRIC MEASUREMENTS  (continued)

5.1 Photometry Within The Beam (continued)


5.1.2 Quantity of Light  Q
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Key words:
FLUX*TIME | LUMEN*SECOND | lm s | LUMINOUS ENERGY |CW LIGHT | TRANSIENT LIGHT


Definition:
Quite similar like in para. 4.1.2, we have to multiply FLUX*TIME :

                  (luminous flux) * time = (quantity of light)
or                       (Phi)    *   t  =    Q



In Photometry, the unit to apply is
                   LUMEN*SECOND
or                     lm s


Other name of the same quantity is "LUMINOUS ENERGY".


For measurement procedures with CW LIGHT, with pulsed light, and with TRANSIENT LIGHT, please see para. 4.1.2. And please also underfill the detector aperture.



Continued: 5.2 Photometry at Light Emitting Plane

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